diff --git a/zsnes/src/win/safelib.c b/zsnes/src/win/safelib.c
index 67eefaba..aa59440f 100644
--- a/zsnes/src/win/safelib.c
+++ b/zsnes/src/win/safelib.c
@@ -14,6 +14,7 @@
 #define pipe _pipe
 #define flushall _flushall
 #define fdopen _fdopen
+#define P_NOWAIT _P_NOWAIT
 
 #ifndef STDIN_FILENO
 #define STDIN_FILENO fileno(stdin)